Malicious PDF — malware analysis report

Static analysis result for SHA-256 8613fa7d5df38b6e…

MALICIOUS

PDF

89.1 KB Created: 2021-10-12 17:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1518500b0ccf35ef68c004704e634eb3 SHA-1: 5294eccdc8fcb779b988d0127a41a4c134ba700b SHA-256: 8613fa7d5df38b6e577ed8993f499f69ae6f7d13d2f4746833050dd77dd80952
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://aviteksural.ru/admin/ckfinder/userfiles/files/40134055988.pdf In PDF document text
    • https://tsegypt.com/file/7260807385.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/65877311407.pdfIn PDF document text
    • http://tnmkor.com/FileData/ckfinder/files/20211007_2ADF21B94CD7EDFB.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/56653486719.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/ramixedixelazogatudo.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162d62b9e5aa---davowularerevunozuzeje.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/54083435135.pdfIn PDF document text
    • https://preciseenergygroup.com/media/sivaseviniwekatizowuj.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7d20cf4755165f79ae4bd9d62c9b0f3c/dejilemirebono.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/mibojo.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/57440039475.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/97815525390.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/19160254725.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/10381782089.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/sb5d82s963tbni41d4umhcm3ef/noxediwupibitowigenenod.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/gipasuluvesara.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/59535653692.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/rosapavujiku.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/38215149796.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/84370647316.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/81644976552.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109031934236903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/u-9XGpgKpwY/uplcv?utm_term=becoming+michelle+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DD 19780 bytes
SHA-256: 37751d9aa5f3b4baf47803ec15ce38ef8815c04ae11be166f96600b9583fb4af
font_01_sfnt_off0001272e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272E 10592 bytes
SHA-256: 9ab23f66453a60ae6586d5c94271c005c99c36d202931514014db4478f45970c
font_02_sfnt_off00013edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1